Influence of Boundary Scattering on Imaging and Inspection of Ultrasonic Shear Horizontal-guided Waves

2011 ◽  
Vol 47 (16) ◽  
pp. 14 ◽  
Author(s):  
Xinjie ZHU
Keyword(s):  
Guided Waves ◽  
Boundary Scattering ◽  
Ultrasonic Shear ◽  
Shear Horizontal

Propagation of Ultrasonic Shear Horizontal Waves in Rectangular Waveguides

2016 ◽  
Vol 16 (08) ◽  
pp. 1550041 ◽  
Author(s):  
Rymantas Kažys ◽  
Egidijus Žukauskas ◽  
Liudas Mažeika ◽  
Renaldas Raišutis
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Guided Waves ◽  
Rectangular Cross Section ◽  
Finite Width ◽  
Horizontal Wave ◽  
Rectangular Waveguides ◽  
Pulse Type ◽  
Ultrasonic Shear ◽  
Shear Horizontal

The aim of this paper is to investigate the propagation of ultrasonic shear horizontal guided waves along waveguides with a rectangular cross-section and with a finite constant and variable width and to determine the peculiarities of propagation of those waves. The dispersion curves of guided waves in finite-width waveguides were modeled by using a semi-analytical finite element (SAFE) technique. The propagation of pulsed shear horizontal ultrasonic guided waves was investigated numerically by using 3D finite element modeling. It was found that in the case of finite-width waveguides, the SH0 shear horizontal wave splits into a family of SH-type dispersive modes propagating with different phase velocities. It was also found that the number of propagating modes depends on the width-to-thickness ratio. The first time spatial distributions of pulsed displacements across the waveguide were determined for waveguides of different widths. Investigation of the waveguides with a rectangular cross-section and varying lateral dimensions was performed. It was found that by properly selecting the geometry of the transient zone of waveguides with a rectangular cross-section, it is possible to improve the performance of such waveguides, e.g. to increase the amplitude of the transmitted pulse type signal without significant distortions of the waveforms.

scholarly journals Machine Learning Based Corrosion-like Defect Estimation with Shear-Horizontal Guided Waves Improved by Mode Separation

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Mateus Gheorghe de Castro Ribeiro ◽  
Alan Conci Kubrusly ◽  
Helon Vicente Hultmann Ayala ◽  
Steve Dixon
Keyword(s):  
Machine Learning ◽  
Guided Waves ◽  
Mode Separation ◽  
Defect Estimation ◽  
Shear Horizontal

Measurement of the viscosity–density product using multiple reflections of ultrasonic shear horizontal waves

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e1031-e1036 ◽  
Author(s):  
Margaret S. Greenwood ◽  
Justus D. Adamson ◽  
Leonard J. Bond
Keyword(s):  
Multiple Reflections ◽  
Ultrasonic Shear ◽  
Shear Horizontal

Detection of Defects in Titanium Using Shear Horizontal Guided Waves

2021 ◽  
Author(s):  
Christian Peyton ◽  
Rachel S. Edwards ◽  
Steve Dixon ◽  
Ben Dutton ◽  
Wilson Vesga
Keyword(s):  
Guided Waves ◽  
Wave Mode ◽  
Guided Wave ◽  
Inspection System ◽  
Wave Direction ◽  
Finite Element Software ◽  
Small Defect ◽  
Back Face ◽  
The Relationship ◽  
Shear Horizontal

Abstract This paper investigates the interaction behaviour between the fundamental shear horizontal guided wave mode and small defects, in order to understand and develop an improved inspection system for titanium samples. In this work, an extensive range of defect sizes have been simulated using finite element software. The SH0 reflection from a defect has been shown previously to depend on its length as the total reflection consists of reflections from both the front and back face. However, for small defect widths, this work has found that the width also affects this interference, changing the length at which the reflection is largest. In addition, the paper looks at how the size of the defect affects the mode converted S0 reflection and SH0 diffraction. The relationship between the SH0 diffraction and defect size is shown to be more complex compared to the reflections. The mode converted S0 reflection occurs at an angle to the incident wave direction; therefore, the most suitable angle for the detection has been found. Simultaneous measurement of multiple waves would bring benefits to inspection.

Immunity of the second harmonic shear horizontal waves to adhesive nonlinearity for breathing crack detection

2021 ◽  
pp. 147592172110571
Author(s):  
Fuzhen Wen ◽  
Shengbo Shan ◽  
Li Cheng
Keyword(s):  
Crack Detection ◽  
Guided Waves ◽  
Lamb Waves ◽  
Second Harmonic ◽  
Sh Waves ◽  
High Order Harmonic ◽  
Thin Walled Structures ◽  
Harmonic Shear ◽  
Contact Acoustic Nonlinearity ◽  
Shear Horizontal

High-order harmonic guided waves are sensitive to micro-scale damage in thin-walled structures, thus, conducive to its early detection. In typical autonomous structural health monitoring (SHM) systems activated by surface-bonded piezoelectric wafer transducers, adhesive nonlinearity (AN) is a non-negligible adverse nonlinear source that can overwhelm the damage-induced nonlinear signals and jeopardize the diagnosis if not adequately mitigated. This paper first establishes that the second harmonic shear horizontal (second SH) waves are immune to AN while exhibiting strong sensitivity to cracks in a plate. Capitalizing on this feature, the feasibility of using second SH waves for crack detection is investigated. Finite element (FE) simulations are conducted to shed light on the physical mechanism governing the second SH wave generation and their interaction with the contact acoustic nonlinearity (CAN). Theoretical and numerical results are validated by experiments in which the level of the AN is tactically adjusted. Results show that the commonly used second harmonic S0 (second S0) mode Lamb waves are prone to AN variation. By contrast, the second SH0 waves show high robustness to the same degree of AN changes while preserving a reasonable sensitivity to breathing cracks, demonstrating their superiority for SHM applications.

Imaging and Testing of Ultrasonic Sh Guided Waves in Plate with Lap Welding Structure

2011 ◽  
Vol 301-303 ◽  
pp. 603-609
Author(s):  
Xin Jie Zhu ◽  
Zan Dong Han ◽  
Dong Du ◽  
Yi Fang Chen ◽  
Ke Yi Yuan
Keyword(s):  
Guided Waves ◽  
Experimental System ◽  
Destructive Testing ◽  
Long Distance ◽  
Testing Zone ◽  
Lap Welding ◽  
Corrosion Defects ◽  
Synthetic Aperture Focusing ◽  
Non Destructive ◽  
Shear Horizontal

The imaging and testing of ultrasonic SH (Shear Horizontal) guided waves may be used into testing and SHM (Structure Health Monitoring) of industrial plate with welding structure in service, which have much more important applied potential. During imaging and testing for steel plate with lap welding structure, photoelastic experiment on propagation of guided waves in Plexiglas plate was studied to clearly see the excellent advantages of SH guided waves. The mode of SH guided waves was analyzed to select the zero order mode SH0 and the SH guided waves transducer with SH0 mode was developed. Based on the synthetic aperture focusing method，a multichannel ultrasonic imaging and testing experimental system of ultrasonic SH guided waves was constructed，the imaging of plate with lap welding structure was mainly studied. The research results shows the ultrasonic SH guided waves and the transducers are fit for long distance testing for the plate with lap welding structure. The ultrasound scattering nearby the weld may cause a blind testing zone, about 150 mm wide, in which the less size corrosion defects at the blind zone could not be revealed in image, so as to lead to defects “no testing”. The imaging and testing of ultrasonic SH guided waves would be used for non-destructive testing of plate with lap welding structure, which image both can characterize the corrosion defects and lap welding structure, and realize the precise location of the weld. The proposed research provides important foundation for improving ultrasonic guided waves imaging and testing quality and SHM of industrial in-site plate with lap welding and larger size.

Sign in / Sign up

Export Citation Format

Share Document